EF ECOFLOW EFYJ751-PCS-US Delta Pro Ultra Inverter User Manual

EcoFlowDELTAProUltraUserManual

Disclaimer

PleasereadthisUserManualandensureyouunderstanditfullybeforeusingtheproduct.



PleasekeepthisUserManualproperlyforfuturereference.



Inthismanualandotherrelated

documents,EcoFlowDELTAProUltraInverterisreferredtoastheinverter,andEcoFlowDELTA

ProUltraBatteryisreferredtoasthebattery.Failuretoproperlyoperatethisproductcould

causeseriousinjurytoyourselforothers,orcausedamagetothisproductandotherproperty.

Byusingthisproduct,youaredeemedtohaveunderstood,acknowledged,andacceptedall

termsandcontentsofthisdocument.Individualusersareresponsiblefortheiractionsandthe

consequencesofthoseactions.EcoFlowherebydisclaimsanyliabilityforanylossesduetothe

user'sfailuretousetheproductinaccordancewiththeUserManual.

Incompliancewithlawsandregulations,EcoFlowreservestherighttofinalinterpretationof

thisdocumentandalldocumentsrelatedtotheproduct.Thisdocumentissubjecttochanges

(updates,revisions,ortermination)withoutpriornotice.PleasevisitEcoFlow'sofficialwebsite

toobtainthelatestproductinformation.

SymbolConventions

Thesearesafetywarningsymbols.Suchsafetyinformationalertsyoutohazardsthatcanbe

lethaltoyouandothers,andthatcancausedamagetotheequipment.Allsafetyinformationis

precededbysafetywarningsymbolsandhazardwords,including:"DANGER","WARNING",

"CAUTION",and"NOTICE".The"DANGER","WARNING","CAUTION",and"NOTICE"statementsin

thismanualdonotcoverallthesafetyinstructions.Theyareonlysupplementstosafety

instructions.

Symbol

Description

Veryhighrisk.Ifnotavoided,itcouldleadtosevereinjuryor

evendeath.

Moderaterisk.Ifnotavoided,itcouldleadtosevereinjuryor

evendeath.

Lowerrisk.Ifnotavoided,itmayresultinminorormoderate

injury.

Potentiallyhazardous.Ifnotavoided,itcouldresultin

equipmentdamage,dataloss,performancedeterioration,or

unanticipatedresults.

SafetyInstructions

WARNING

SAVETHESEINSTRUCTIONS

‒

ThismanualcontainsimportantinstructionsformodelEFYJ751-

PCS-USandEFYJ751-BPthatshallbefollowedduringinstallationandmaintenance.

1. Beforeinstalling,usingandmaintainingtheproduct,pleasereadcarefullythesafety

instructionsinthismanual.EcoFlowisnotresponsibleforanyproblemscausedbyimproper

handlingoftheproductininstallationandmaintenanceprocedures.

2. Donotusepartsoraccessoriesthatarenotofficiallysupplied.Useofthird-partyaccessories

mayresultinriskssuchasfireandelectricshock.Ifpartsoraccessoriesarenecessary,please

visitEcoFlow

’

sofficialsaleschannelforpurchaseinformation.EcoFlowisnotresponsible

forproductproblemscausedbytheuseofcablesandotheraccessoriesproducedbythird-

partymanufacturers.

3. Keepthisproductoutofthereachofchildrenandpetsandcloseattentionisrequiredto

preventpotentialhazardswhenchildrenorpetsareclosetothedevice.

4. StrictlycomplywiththeambienttemperatureinthisUserManualwhenusingthisproduct.If

thetemperatureistoohigh,thebatterymaycatchfireorexplode.Ifthetemperatureistoo

low,theproductmaynotworknormally.

5. Donotdisassemble,modifyorreplacethisdevice(includinginternalandexternalparts),if

necessary,pleasecontactqualifiedprofessionalsorcontactEcoFlowafter-salesservicefor

handling.

6. Donotplaceotherheavyobjects(excepttheinverterandbatteries)onthedeviceduringuse

orstorage.

7. Avoidimpacts,falling,droppingorstrongvibrations.Inthecaseofsevereexternalimpact,

pleaseturnoffthepowerimmediatelyandstopusingtheproduct.Ensuretheproductiswell

fastenedduringtransportationtoavoidvibrationsandimpacts.

8. Iftheproductfallsintowateraccidentallyduringuse,placeitinasafeopenareaandstay

awayfromituntilitiscompletelydry.Thedriedproductshouldnotbereusedandshouldbe

disposedofproperlyasdescribedinthe"Disposal"sectionbelow.Iftheproductcatchesfire,

pleaseuseafireextinguisherorfire-fightingequipmentinthefollowingrecommended

order:waterormist,sand,fireblanket,drypowder,andcarbondioxidefireextinguisher.

9. Handlethisproductwithcaretopreventitfrombeingdamagedduetooverturning.Ifthe

productisbadlydamagedafteroverturning,pleaseturnoffthepowerimmediately,place

thebatteryinanopenareaawayfromcombustiblematerialsorpeople,andproperly

disposeofitaccordingtotherequirementsoflocallawsandregulations.

10. Electromagneticfieldscreatedbythisproductmayaffectthenormalfunctioningofmedical

implantsorpersonalmedicaldevices,suchaspacemakers,cochlearimplants,hearingaids,

defibrillatorsandsoon.Ifyouareusingthesemedicaldevices,pleaseconsultthe

manufacturersabouttherestrictionsontheuseofrelevantdevicestoensurethatasafe

distanceismaintainedbetweenthisproductandtheimplantedmedicaldevices(suchas

pacemakers,cochlearimplants,hearingaids,defibrillatorsandsoon)duringoperation.

11. Whenthepowersupplyisconnectedinnormalmodetoarefrigerator,powerfluctuationsof

therefrigeratormaycausethedevicetoautomaticallyshutdown.Therefore,whenthe

deviceisconnectedtoarefrigeratorthatstoresmedicine,vaccinesorothervaluableitems,

itisrecommendedtosettheACoutputto"AlwaysOn"intheappinordertoguarantee

continuouspowersupply,andpleasepayattentiontothepowerconsumptionofthedevice.

12. Aftertheinstallationiscompleted,cleanuptheitemsintime,suchascartons,foam,plastic,

cableties,etc.

EnvironmentalRequirements

1. Ensurethatthedeviceisinstalledinaventilatedenvironment,anddonotblockthevents

whenthedeviceisinoperation.Inadequateventilationmaydamagethedevice.

2. Donotusethisproductnearheatsourcesorhightemperatures(e.g.firesourcesorhot

stoves).Toprolongthebatterylife,itisrecommendedtouseorstorethisproductat20°Cto

30°C.

3. Wheninstallingorusingtheproductinanenvironmentnearfumes,smoke,heat,steamor

dust,itisnecessarytouseaprotectivecovertopreventtheriskoffire.

4. Theinstallationenvironmentshouldbehardflatground.Duetothelargemassofthedevice,

itisnecessarytoensurethattheinstallationenvironmentofthedeviceisstableandthatthe

equipmentdoesnottilttoavoidpersonalinjuryorproductdamage.

5. Keeptheproductawayfromhumidenvironments,donotimmerseitinwaterorgetitwet.If

theproductisinstalledorplacedneartheseaoranywaterways,werecommendusing

moisturebarrierbagstopreventtheproductfromgettingsoaked,otherwise,itmaycausea

riskoffire.Ifwaterisfoundinsidetheproduct,pleaseturnofftheproductandstopusingit

again.Takeanti-electricshockmeasuresbeforetouchingtheproduct,andputitimmediately

inasafe,waterproofandopenarea.ContactqualifiedpersonnelorEcoFlowafter-sales

serviceifnecessary.

SafetyRequirements

1. Donotstand,leanorsitonthedevice.

2. Iftheproductwillnotbeusedforalongperiodoftime,makesurethatitisunpluggedfrom

theoutletandturnedoff.

3. Donotconnectthisdevicewithdamagedcables.Useofdamagedcablesmayaffectthe

normaloperationofthedeviceorleadtopotentialrisks.

4. Donotputyourhandsorforeignobjectsintothedeviceportsorvents.

DisposalRequirements

EcoFlowDELTAProUltraInverter



Iftheinvertercannotworkanymore,disposeofitaccordingtothelocaldisposalrequirements

forelectricalequipmentwaste.Theinvertercannotbedisposedoftogetherwithhousehold

waste.

1. Beforeremovingtheinverter,poweritoff.Fordetails,checkPowerOn/Offin"usermanual".

2. Sequentiallydisconnectthefastcharginginputcable,PVinputcables,batterycables,andall

theothermodulesconnectingtotheinverter.

2. Removetheinverterandthebatteryfromtheportablestand.

4. Packandstoretheinverterproperly.

EcoFlowDELTAProUltraBattery



1. Ifconditionspermit,makesurethatthebatteryisfullydischargedbeforedisposingitina

designatedbatteryrecyclingbin.Theproductcontainsbatterieswithpotentiallydangerous

chemicals,soitisstrictlyprohibitedtodisposeofitinordinarytrashcans.Formoredetails,

pleasefollowthelocallawsandregulationsonbatteryrecyclinganddisposal.

2. Ifthebatterycannotbefullydischargedduetoaproductfailure,pleasedonotdisposeofthe

batterydirectlyinthebatteryrecyclingbox.Insuchcase,youshouldcontactaprofessional

batteryrecyclingcompanyforfurtherprocessing.

3. Pleasedisposeofover-dischargedbatteriesthatcannotberecharged.

Specifications

EcoFlowDELTAProUltraInverter



GeneralInformation

Model

EFYJ751-PCS-US

Weight

Approx.31.7kg

Dimensions

Approx.690×481×214mm(27.2×18.9×8.4in.)

Wi-Fi

Frequencyrange:2,412-2,462MHz/2,422-2,452MHz

Maximumoutputpower:0.3597W

Bluetooth

Frequencyrange:2,402-2,480MHz

Maximumoutputpower:0.0109W

OutputInformation

ACOutput(Discharging)

Puresine,7,200Wtotal,120/240V~60Hz

ACOutput(Bypass)

100-120V~30Amax,50/60Hz

USB-A

（

×2

）



5V2.4A,12Wmaxperport,total24W

USB-C(×2)

5/9/12/15/20V5A,100Wmaxperport,total200W

DCOutput(×1)

12.6V30A,378Wmax

InputSpecifications

ACInput(Charging)

100-120V~15A;200-240V~12.5A,50/60Hz

ACInput(Bypass)

100-120V~15A,50/60Hz(duration<3hrswhenthecurrentexceeds12A)

PowerInput/OutputPort

100-120V~30A,200-240V~30A,50/60Hz

HighVoltagePVInput

80-450V15Amax,4,000Wmax

LowVoltagePVInput

30-150V15Amax,1,600Wmax

AmbientTemperature

DischargingTemperature

−

20°C-45°C(

−

4°F-113°F)

ChargingTemperature

−

20°C-45°C(

−

4°F-113°F)

StorageTemperature

−

20°C-45°C(

−

4°F-113°F)(optimumat20°C-30°C/68°F-86°F)

OtherInformation

Altitude

≤

3,000m(

≈

9,842ft)

IPRating

IP54

NoiseLevel

<30dB

UPS

BackupUPS<20ms,onlineUPS0ms

CommunicationMethod

CAN&Wi-Fi&WAN&4G

1. PressandholdtheACoutputswitchfor10secondstoswitchtheACoutput

frequency.

2. TheIPratingisIP54whentheproductisnotinuse.

3. Formostscenarios,noiseleveloftheproductislessthan30dB.

4. Whentheambienttemperatureexceeds40°C(104°F),thecharginganddischarging

powerarerecommendedtobeequaltoorlessthan5,000Wwhenchargingand

dischargingtheproductatthesametime.

EcoFlowDELTAProUltraBattery



GeneralInformation

Model

EFYJ751-BP

Name

RechargeableLi-ionbatterypack

Weight

Approx.50.7kg(111.8lbs)

Dimensions

Approx.660×455×204mm(26×18×8in.)

Capacity

102.4V60Ah,6,144Wh

BatterySpecifications

CellMaterial

LFP

CycleLife

Thebatterymaintains80%+SOH(stateofhealth)after3,500

cyclesat0.5C/0.5Cat25°C(77°F)

ProtectionType

Overvoltageprotection,overloadprotection,overtemperature

protection,shortcircuitprotection,low-temperature

protection,lowvoltageprotection,overcurrentprotection

AmbientTemperature

DischargingTemperature

−

20°C-45°C

ChargingTemperature

−

20°C-45°C

StorageTemperature

-20°Cto45°C(-4°Fto113°F)(optimal20°Cto30°C(68°Fto86°F))

OtherInformation

Altitude

≤

3,000m(

≈

9,842ft.)

IPrating

IP54

1. Whethertheproductcanbechargedordischargeddependsontheactual

temperatureofthebattery.

2. Thebatterywillautomaticallystartself-heatingifthetemperatureislower

than0°C(32°F).Todisablethis,pleasesetitintheapp.

What'sintheBox

1. Afterunpacking,ensurethatallcomponentsareintact.ContactEcoFlow

customerserviceifthereisanymissingordamagedcomponent.

2. Forcomponentsnotincludedinthebox,pleasepurchasethemonthe

officialwebsite.

EcoFlowDELTAProUltra



EcoFlowDELTA

ProUltraInverter

(×1)

EcoFlowPortable

Stand(×1)

EcoFlow

SupportingLeg

(×4)

M6*20(×4)

EcoFlowSide

MountCaster(×4)

EcoFlow

Disassemblyand

AssemblyTool

(×1)

EcoFlowSolartoLow-

PVPortCharging

Cable(×1)

EcoFlowAC

ChargingCable

(×1)

UserManual&

WarrantyCard

EcoFlowDELTAProUltraBattery(notincludedintheinverterpackage)



TheEcoFlowDELTAProUltraInvertermustbeusedtogetherwithEcoFlow

DELTAProUltraBatteryasawholeset.

EcoFlowDELTAProUltraBattery

EcoFlowBatteryConnectionCable

OptionalComponents(notinthebox)

EcoFlowTrolley

EcoFlowEVX-StreamAdapter

EcoFlowACGeneratorChargingAdapter

EcoFlow50AmpHub

EcoFlowFixingMetalTab

EcoFlowSolarPanels

ProductIntroduction

1. Theillustrationsprovidedinthisdocumentarefordemonstration

purposesonly.Productdetailsmayappearslightlydifferentdepending

ontheproductversionandmarketregion.

2. Specificationsanddescriptionsinthisdocumentmaychangewithout

notification.EcoFlowreservestherighttomodifythedocumentdueto

productupdate.Tocheckordownloadthelatestdocuments,please

visittheofficialwebsiteforreference.

ProductOverview

EcoFlowDELTAProUltraInverter



Pleaseensurethattheproductisinstalledinawell-ventilatedplaceanddo

notblocktheventilationfansduringoperation.Insufficientventilationmay

damagetheequipment.

1. 4Gdongleport

2. ACoutputsocket(120V20Amax.perport)-Backup

UPS

3. ACoutputsocket(120V20Amax.perport)-Online

UPS

4. ACoutputsocket(120V30Amax.)-OnlineUPS

5. ACoutputsocket(120V/240V30Amax.)-BackupUPS

6. Groundscrew

7. ACcharginginputport

8. ACchargingspeedswitch

9. High-PVinputport

10. Lockhole

11. PVswitch

12. Powerinput/outputport

13. Batteryport

14. USB-C100Woutputport

15. ACpowerbutton

16. MainPowerbutton

17. DCpower



port

18. USB-Aoutputport

19. DCoutputbutton

20. Low-PVinputport

21. Vent

EcoFlowDELTAProUltraBattery



1. Batteryport

2. Mainpowerbutton

3. LEDindicator

Howtoopencovers



EcoFlowDELTAProUltraInverter



Openthefrontcovers

Openthesidecovers(remembertoinserttheminto

grooves)

EcoFlowDELTAProUltraBattery

Openthesidecovers(remembertoinsertthemintogrooves)

BatteryCapacityDescription

Theratedcapacityofthebatteryis6,144Wh.Toexpandcapacity,theinvertercanconnecttoup

to5batteries.EcoFlowFixingMetalTabsneedtobeinstalledwhenconnectingoneinverterto

morethanthreebatteries.

ProductDimension

Datainthefollowingillustrationisforreferencepurpose,pleaserefertothe

actualproduct.

LCDScreen

1. Totalinputpower

11. Errorreport

21. DCoutput

2. Inputindicator

3. 4Gconnection

4. Wi-Ficonnection

5. Bluetoothconnection

6. Backupmode

7. Low-tempwarning

8. High-tempwarning

9. Self-consumptionmode

10. Batteryfailurewarning

12. Errorcode

13. Ventilationfan

14. Charginglimit

15. Timer

16. Charging/discharging

level

17. ACoutput

18. Outputindicator

19. Totaloutputpower

20. Poweroutput

22. USB-Aoutput

23. USB-Coutput

24. Remainingbatterypercentage

25. Remainingcharging/discharging

time

26. Numberofbatteries

27. Low-PVinput

28. High-PVinput

29. Powerinput

30. ACcharginginput

Numbe

r

Icon

Status

1+2

Solid

Both1and2areshownontheLCDscreenafterthe

productisturnedon

3

Solid

4Gconnectednormally

Off

4Gdisconnected

Blinking

4Gdisconnectedfromtheserver

4

Solid

WiFiconnectednormally

Off

WiFidisconnected

Blinking

WiFidisconnectedfromtheserver

5

Solid

Bluetoothconnectednormally

Off

Bluetoothdisconnected

Blinking

Blinksfor10secondswhentheproductisunbound

6

Solid

Energymanagementenabled

Off

Energymanagementdisabled

7

Blinking

Low-temperror

8

Blinking

High-temperror

9

Solid

Batteryintheprocessofheating

Off

Batterynotheated

10

Blinking

Batteryfailure

11+12

Solid

Whenthereisanerror,12showsupsolid;youcan

checktheerrorcodechecklistfordetailsoraskafter-

salesservice

Blinking

Whenthereisanerror,11showsupblinking

13

Blinking

Ventilationfanfailure

14



Solid

Slowcharging(max.powernotsetintheapp)or

charginglimit

Off

Chargingwithfullpower

15

Solid

Therearescheduledtasks

Off

Noscheduledtask

16

Solid

Showsupwhenchargingordischarginglevelsareset

intheapp

Blinking

Batterylevelhasreachedthechargingordischarging

level

17

Solid

ACoutputandfrequency

Blinking

ACoutputerrororinvertercommunicationerror

18+19

Solid

Both1and2areshownontheLCDscreenafterthe

productisturnedon

24

Solid

Remainingbatterypercentage

25

Solid

Remainingchargingtime

Solid

Remainingdischargingtime

26

Solid

Numberofbatteriescurrentlyconnected

1. DCoutputshowsupontheLCDscreenifDCpowerbuttonisenabledaftertheproduct

hasbeenturnedon.

2. Alltheiconsunder"OUTPUT"willonlyshowupwhenoutputportsoftheproductare

connected;theseiconsstarttoblinkwhenthereisaproductfailure.

3. Alltheiconsunder"INPUT"willonlyshowupwheninputportsoftheproductare

connected;theseiconsstarttoblinkwhenthereisaproductfailure.

4. Therotatingspeedoftheventilationfanicondependsonthegear.

5. Formoredetailsabouterrorcodes,pleasevisittheEcoFlowofficialwebsiteorcontact

EcoFlowcustomerservice.

Installation

EcoFlowPortableStandInstallation

1. Theportablestandneedstobeinstalledonahard,flatsurfaceinsteadofsoftsurfaces

(forexample,dirtorsand).

2. Donotplacetheportablestandonatiltedsurfaceasitmaycausetheproductto

toppleover,potentiallyresultinginpersonalinjuryorproductdamage.

1

Flickthebrakedowntolockthecasters.

2

Mountthecastersinthecorrespondingholes

oftheEcoFlowPortableStand.

3

Putthewell-installedportablestandonaflat

surface.

ProductInstallation

1. Astheproductisveryheavy,we

recommendthattwopeoplecarryit

toavoidpotentialpersonalinjury.

2. Ensurethatthebatteryportsof

bothinverterandbatteryareonthe

samesidewhenyouinstallthem,

otherwise,youcan'tconnectthem

withthebatterycable.

1

Alignthebatterywithgroovesofthe

portablestand.

2

Repeattheactioninstep1tomountthe

inverterontothebattery.

1. Toavoidaccidentalunplugging,we

recommendthatyoulockthebattery

cable.Afteryoumountthebattery

cable,youcanlockthecablewitha

flatheadscrewdriver;whenyouneed

toremovethecable,rememberto

unlockitfirst.

2. Oneinvertersupportsupto5batteries.

3

Opentheprotectivecoverofthebatteryport,

thenconnectthebatterycabletotheport.(For

moreinstallationoptions,youcanalsopurchase

the1-meterlongbatteryconntectioncablefrom

EcoFlowofficialwebsite.)

4

Beawareofthedirectionofbatterycableswhen

youmountmorethan1battery.

5

Ifyouhave2setsofproducts,youcanputone

setontopoftheotherset.Benotedthatthetop

setshouldbeinstalledwithsupportinglegs

insteadofcasters.

1. Forlong-timeuse,lockcastersby

flickingthebrakedown,sothat

theproductcan'tbemoved

anymore.Ifyouneedtomovethe

product,flickthebrakeupto

unlockthecasters.

2. Donotmovethewholesetof

productsifyouconnectthe

invertertothreeormorebatteries.

3. Wesuggestthatyoufixthewhole

setofproductswithfixingmetal

tabsifyouconnect3ormore

batteriestotheinverter.Thefixing

metaltabsareinstalledonthe

batterydirectlyundertheinverter.

Formoredetails,pleasereferto

thequickstartguideofEcoFlow

FixingMetalTab.

4. Therecommendedinstallation

distancefromthewallis5cmfor

thepurposeofheatdissipation.

Toeasilymovetheproduct,youcan

alsomountthesetonthetrolley,refer

tothequickstartguideofEcoFlow

Trolleyfordetails.(Note:youcanonly

mountoneinverterandonebatteryon

thetrolley.)

Grounding

WhentheproductconnectedtoPV

modulesisputinsidethebuilding,

itneedstobegroundedtoreduce

theriskofelectricshock.Before

usingthegroundterminal,consult

aqualifiedelectrician,electrical

inspector,orlocalagencyhaving

jurisdictionforlocalcodesor

ordinancesthatapplytothe

intendeduseoftheproduct.

PowerOn/Off

•

Iftheproductisturnedoff,itwillautomaticallyturnonwhenyou

connecttheproducttoawalloutlet.

•

Whentheproductisturnedon,theLCDscreenwilllightup;pressing

themainpowerbuttonagainwillturnofftheLCDscreenbutwillnot

turnofftheproduct.

•

Iftheinverterisconnectedtomorethanonebattery,youcanpress&

holdthemainpowerbuttonofanybatterytoturnontheproduct.

•

Theproductwillgointostandbymode,withtheLCDscreenshutdown,

ifithasn'tbeenusedfor5minutes.Whenyoustarttousetheproduct

again,theLCDscreenwillturnonautomatically.

•

Thedefaultstandbytimeoftheproductis2hours.Theproductwill

automaticallyshutdownifoutputpowerbuttonsareturnedofforno

loadsareconnectedfor2hours.

•

Pressandholdthemainpowerbuttonfor10secondstoresetthe

Bluetoothconnection.

Option1

Longpressthemainpowerbuttonoftheinverterfor1secondtoturnontheproduct.Pressandholdfor

2-3secondstoturnofftheproduct.

•

Poweron:longpressfor1second

•

LCDscreenoff/on:pressonce

•

Poweroff:pressandholdfor2-3

seconds

Option2

Longpressthemainpowerbuttonofthebatteryfor1secondtoturnontheproduct.Pressandholdfor

2-3secondstoturnofftheproduct.

•

Poweron:longpressfor1second

•

LCDscreenoff/on:pressonce

•

Poweroff:pressandholdfor2-3

seconds

LEDIndication

Status

Description

Poweron

LED1to5sequentiallylightsup

Poweroff

LED5to1sequentiallyshutsdown

Discharging

81%~100%

：

LED1to5solid

61%~80%

：

LED1to4solid

41%~60%

：

LED1to3solid

21%~40%

：

LED1to2solid

1%~20%

：

LED1solid

：

LED1toLED5blinking

Charging

0~20%

：

LED1blinks

21~40%

：

LED1remainssolid,LED2startstoblink

41~60%

：

LED1to2remainsolid,LED3blinks

61~80%

：

LED1~3solid,LED4blinks

81~99%

：

LED1~4solid,LED5blinks

100%

：

LED1toLED5remainsolid

BMShigh-tempnotice

LED2blinks

BMSlow-tempnotice

LED3blinks

Upgradefirmwarestatus

LED2andLED3blinkalternately

Heatingabnormalityduringcharging

LED4blinksforabout10seconds

Heatingabnormalityduringdischarging

LED5blinksforabout10seconds

ChargeYourAppliances

AC/DCOutput



PresstheDCpowerbuttonorACpowerbuttontoenableACoutputportsandDCoutputports,

andpressagaintodisablethem.

•

Ensurethattheproductisturnedon(check"PowerOn/Off"fordetails)before

enablingDC/ACoutput.

•

Ensurethatthetotalpowerofallloadsislessthantheratedpowerofthe

product.

•

After12hoursofnoloadfortheACoutputports,theACpowerbuttonwillturn

offautomatically.

RechargetheProduct



ACCharging

KeeptheACpowerbuttonoffwhilerechargingtheproductthroughahigh-voltagewall

outlet.

YoucanrechargetheproductbyconnectingthesuppliedACchargingcabletothefastcharging

inputportoftheproductandawalloutlet.Toadjustthechargingspeed,youcaneitherflickthe

ACchargingspeedswitchorsetitupintheEcoFlowapp.

AdjusttheACchargingspeed

ThechargingspeedcanbeadjustedviatheACchargingspeedswitch.Turntheswitchtothe

left,thechargingspeedwillbeatitspeak;turntheswitchtotheright,andthechargingspeed

willreturntothedefaultvalue.Youcansetthechargingspeedintheapp.

Fastcharging:1,800Wmax/3,000W

max

Defaultcharging:500W

SolarCharging

•

TosecurelyconnectthisproducttothePVsystemcircuit,werecommendthatyou

consultqualifiedpersonnelforinstallationandotherdetails.

•

Solarpanelsandhigh-PVinputchargingcablesarenotincludedinthebox;please

purchasethemontheEcoFlowofficialwebsiteandensurethatsolarconnectorsofsolar

panelsarecompatiblewithhigh-PVinputports.

•

Thetotaloutputofthesolarpanelsandthesunlightintensitydeterminethedurationof

thesolarcharging.

•

Ensurethatthemaximumcurrentoutputofallsolarpanelsdoesnotexceed15Aifyou

connecttheminparallel.Whenconnectingsolarpanelsinseries,ensurethatthe

maximumvoltageoutputofallpanelsiswithin30V-150Vforthelow-PVinputport,and

80V-450Vforthehigh-PVinputport(youcanchooseeitherlow-PVorhigh-PVifthe

maximumvoltageoutputofallpanelsisbetween80Vand150V).

•

Toavoidproductdamage,ensurethatthesolarpanelsareproperlyconnectedtothe

low-voltagePVorhigh-voltagePVinputport.

•

IfyouconnecttheEcoFlowDELTAProUltratoPVsystemcircuitsinstalledonorin

buildings,accordingtoNECregulation,thesystemshallincludearapidshutdown

functiontoensurethesafetyofoperationandreduceshockhazardforemergency

responders.

•

IfyouwishtoconnecttheEcoFlowDELTAProUltratoPVsystemcircuits,theconsultation

beforepurchaseandtheinstallationmustbedonebyaqualifiedelectricianorinstaller.

1. KeepthePVswitch"OFF"whenconnectingsolarpanelstotheproduct.

2. Whetheryouconnectthesolarpanelstothelow-PVinputportorhigh-PVinputport,you

needtoturnonthePVswitchtoenablesolarchargingoncethesolarpanelsare

connected.

1. Connecttosolarpanels

Connectinseries



1)Low-PVinputvoltagerange:30V<panel1+...paneln<150V

2)High-PVinputvoltagerange:Voltagerange:80V<panel1+...paneln<450V

3)Low-PVinput+high-PVinput

Voltagerangeforlow-PVinput:30V<panel1+...paneln<150V

Voltagerangeforhigh-PVinput:80V<panel1+...paneln<450V

Connectinparallel



Currentrange:panel1+...paneln<15A

2. Removesolarchargingcables

1. TurnoffthePVswitch.

2. Alignthed/atoolwithsolarconnectorsanddetachthemmanuallyoncetheyhavedislodged

offfromthehigh-PVinputports.

ChargeviaEVCharger

ConnectyourEVchargertotheproducttoenablechargingviatheEVcharger.

IfyouareunsurehowtoconnectyourEVchargertotheproduct,refertotheusermanualforEV

chargerorcontactthemanufacturerfordetails.

1

ConnectonesideoftheEVadapterto

thepowerinput/outputportandthe

othersidetotheEVcharger.

2

Turnontheproduct.

Toavoidaccidentalunplugging,locktheadapterandunlockitwhenyouneedtoremovethe

adapter(fordetails,check"Installation>ProductInstallation").

ChargeviatheGenerator

Connectyourgeneratortotheproducttoenablechargingviathegenerator.

Ifyouareunsurehowtoconnectyourgeneratortotheproduct,refertotheusermanualfor

generatororcontactthemanufacturerfordetails.

Ensurethatthepoweroftheproductislowerthanthatof

yourgenerator,andthenconnectonesideofthegeneratorto

thepowerinput/outputportorACcharginginputportand

theothersidetothegenerator.

Toavoidaccidentalunplugging,locktheadapterandunlockitwhenyouneedtoremovethe

adapter(fordetails,check"Installation>ProductInstallation").

SolarCharging+ACCharging

Connecttheproducttosolarpanelsandawalloutletatthesametime.

SolarCharging+EVCharger

ConnecttheproducttosolarpanelsandanEVchargeratthesametime.

SolarCharging+Generator

Connecttheproducttosolarpanelsandageneratoratthesametime.

1. WhenbothACcharginginputportandpowerinput/outputportareconnectedtothe

product,thepowerinput/outputportwillbepreferablychosenforchargingwhereasAC

chargingwillnotbeabletowork

2. Whenyouconnecttheproducttomorethanoneoptionforrecharging,youcaneither

connecttolow-PVorhigh-PVinputportsonly,orbothlow-andhigh-PVinputports.

UPS

TheproductsupportsUPS:onlineUPSandbackupUPS.Connecttheproducttoawalloutlet

(check"RechargetheProduct>ACCharging")usingthesuppliedACchargingcableandtoyour

appliancesatthesametime,yourapplianceswillreceivepowerfromthegridbutnotfromthe

product.Ifyourappliancesrequire0msswitching,werecommendthatyouconnectyour

appliancestoACoutputsockets(onlineUPS)foruninterruptedpowersupply.

1. ACoutputsockets-BackupUPSsupport20msswitching.

2. ACoutputsockets-OnlineUPSsupport0msswitching.

WholeHomeBackupSystem

1. Theinstallationshouldbeperformedbyalicensedelectrician.Improperinstallation

mayresultindeathorseriousinjuryandpropertydamage.

2. ThissectionisforreferencepurposeONLYanddoesnotconstitutelegaladvice.Please

consultthelocallicensedelectricianfordetails

Introduction

Apartfromchargingordischargingseparately,theproductcanalsobeusedtocreateawhole

homebackupsystemthatstorespowerforyourappliancesusingthefollowingoptions.Youcan

checkdaily/monthly/yearlyfiguresorconfiguresettingsviatheEcoFlowapp.Youwillenjoyan

outage-freelifeafterinstallingthiswholehomebackupsystem,whichisspecificallysuitablefor

emergencybackupduringtornadoseasons,poweroutage,peakpowerdemand,andsoon.

HowtoConnect

Scheme1

EcoFlowDELTAProUltra(×3setsmax)+EcoFlowSmartHomePanel2(subpanel)+main

panel+meter+grid

Scheme2

EcoFlowDELTAProUltra(×2setsmax)+EcoFlow50AmpHub+50Amptransferswitch+

mainpanel+meter+grid

Scheme3

EcoFlowDELTAProUltra(×1set)+30amptransferswitch+mainpanel+meter+grid

DownloadEcoFlowApp

Control,monitor,andcustomizeyourEcoFlowDELTAProUltrafromafarwiththeEcoFlowApp.

Downloadhere:https://download.ecoflow.com/app

PrivacyPolicy



ByusingEcoFlowProducts,Applications,andServices,youconsenttothe

EcoFlowTermofUseandPrivacyPolicy,whichyoucanaccessviathe

“

About

”

sectionofthe

“

User

”

pageontheEcoFlowApporontheofficial

EcoFlowwebsiteat

https://www.ecoflow.com/policy/terms-of-useand

https://www.ecoflow.com/policy/privacy-policy

Maintenance

EcoFlowDELTAProUltra

1. Askqualifiedpersonneltocheckormaintaintheproduct,andreplacetheoriginal

componentswithidenticalreplacements.

2. Usecleananddryclothorpapertocleandirtorstainsofftheports.Donotcleantheproduct

withchemicalsorcorrosivematerials.

3. Forsafetyreasons,turnofftheproductbeforemaintenancetoavoidtheriskofelectric

shock.

4. Checktheproductregularlyaccordingtothefollowingchecklist

：



Item

Method

MaintenanceInterval

Heatdissipation

Checkperiodicallythatventsarefreefrom

obstaclesanddust.

Every3months

Dirtcleaning

Ifthereisanystain/dirt,useadry,softcloth

towipeitoff.Pleasedon'tuseanyabrasives

orchemicalliquidstocleantheproduct.

Every3months

Systemrunningstatus

1. Checkthattheproductisnotdamagedor

deformed.

2. Ensuretheproductoperateswithno

abnormalsound.

Every3months

Cableconnection

Ensureallcablesareintactandsecurely

connected.

Every3months

EcoFlowDELTAProBattery

1. Thebatterymustremainat45°Cforatleast20hoursduringtwocharge/dischargecycles.

2. Ifthecharging/discharginglevelisnotfullychargedafteronemonthor30cycles,itwill

automaticallychargeupto100%forcalibration(calibration).Whencalibrationiscomplete,it

automaticallyrevertstotheuser-setcharge/dischargelimit.

3. Itisrecommendedtobeusedandstoredinanenvironmentof20°Cto45°C.Keepawayfrom

humidplaces,placeswherewatercangetwet,nearheatsources,andmetals.

4. Forlong-termstorage,pleasedischargetheproducteverythreemonths(firstlydischargeit

to0%,thenfullyrechargeit,andlastlydischargeitto60%);theproductwillnotbecovered

bythewarrantyifitisnotchargedordischargedformorethan6months.

5. Forbatterysafetyandlife,donotstorethisproductinanenvironmentabove45

℃

orbelow

-20

℃

.

6. Ifthebatteryleveldropsbelow1%afterusingtheproduct,chargeitupto60%beforestoring

it.Ifthebatteryisstoredforalongperiodoftime,itwillcauseseriousdamagetothebattery

andshortenitsusagecycle.

7. Ifthebatteryisstoredforalongperiodoftimewithsignificantlylowbattery,theproductwill

gointodeepsleepmodeandmustbechargedandreleasedfromdeepsleepmodebeforere-

use.

ChargingHeating

Chargingheatingisautomaticallyactivatedwhenambienttemperatureisbelow0°C(32°F)and

thebatterywillbeinchargingmode.Theactivationsequenceisasfollows:

1. Chargingheatingrequirescharginginput

≥

250W.Whenthebatteryinternaltemperature

risesabove5°C(41°F),thebatterywillstartheatingaswellaschargingprocess.

2. Whenthebatteryinternaltemperaturerisesabove10°C(50°F),chargingheatingstops,and

batterychargingcontinues.

•

Thechargeheatingfunctionworksintemperaturerangeof-20°C~0°C(-4°F~32°F).

DischargingHeating

Thecapacityofthebatterycanbesignificantlyreducedwhendischargingathighpoweratlow

temperatures.Inthefollowingambienttemperatureconditions,thedischargingheatingfeature

willautomaticallystartwhenthebatteryisdischarging.Thedetailsareasfollows.

1. Whenthetemperatureisbelow-10

℃

(14°F)andtheremainingbatterypercentageisabove

80%,thedischargingheatingwillautomaticallyturnoff.

2. Whenthetemperatureisbelow-5

℃

(23°F)andtheremainingbatterypercentageisbelow

80%andabove60%,thedischargingheatingfeaturewillautomaticallyturnoff.

3. Whenthetemperatureisbelow0

℃

(32°F)andtheremainingbatterypercentageisbelow

60%andabove30%,thedischargingheatingfeaturewillautomaticallyturnoff.

4. Ifthebatterylevelislessthan30%,thedischargingheatingfeaturewillnotturnoff

automatically.

FAQ

1. Dotheoutputportsoftheinverterworkwhiletheproductisbeingcharged?

Iftheproductisconnectedtoahigh-voltagewalloutletoranEVcharger,onlyDCoutputwillbe

abletochargeyourappliances.

2. DoIneedtobuyextensioncablesforlow/high-PVinputports?

Ifyouneedtoconnectseveralsolarpanelsinseriesorparallel,werecommendthatyou

purchaseextensioncables.PleaseconsultEcoFlowcustomerserviceformoredetails.

3. Cantheinverterbeusedonitsown?

No,itcan't.Theinverterdoesnothaveabuilt-inbattery,therefore,itmustbeusedwitha

battery.

4. Istheinvertercompatiblewiththird-partybatteries?

No,theEcoFlowDELTAProUltraInverterisonlycompatiblewiththeEcoFlowDELTAProUltra

Battery.

5. Whatappliancescanbepoweredthroughtheproduct'sACoutputports?

Theproduct'sACoutputportscanpowermosthouseholdapplianceswithamaximumrated

powerof7,200W.Beforeyouuseit,werecommendthatyoucheckthepoweroftheappliances

firstandensurethatthemaximumpowerofallappliancesconnectedislessthantherated

power.

6. Howlongcantheproductchargemydevices?

Theremainingchargingtimeisdisplayedontheinverter'sLCDscreen,whichcanbeusedto

estimatetheremainingchargingtimeformostapplianceswithstablepowerconsumption.

7. HowdoIknowiftheproductischarging?

Whenitischarging,theremainingchargingtimewillbedisplayedontheinverter'sLCDscreen.

8. HowdoIcleantheproduct?

Pleaseuseadry,softandcleanclothortissuetocleantheproduct.

9. CanItaketheproductonaplane?

No,youcan't.Pleasefollowlocallawsandregulationsregardingairtravel.

10. IstheactualoutputpoweroftheproductthesameasthecapacityinSpecifications?

TheproductcapacityinthespecificationsistheratedcapacityoftheEcoFlowDELTAProUltra

Battery.Theremightbepowerlossintheprocessofcharginganddischarging.Pleasereferto

theactualproductorcontactEcoFlowcustomerservicefordetails.

EF ECOFLOW EFYJ751-PCS-US Delta Pro Ultra Inverter

Product's Documents

User ManualEcoFlow DELTA Pro Ultra User Manual

Specifications

EF ECOFLOW EFYJ751 Questions and Answers